On the previous server I used to play, we had a similar Turbo/Smart cast feature as well, however, it wouldn’t affect the chat itself, so you could bind any key without affecting your ability to chat.
I don’t know how it can be implemented, but if it’s possible to improve the Turbo feature to be “smart” it would really improve the tool, as I could bind way more keys without having to deal with the chat issues.
Example:
Currently, I have 4 on Turbo, so anytime I type 4 in chat it goes 44444444444444444 due to turbo.